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A bio-realistic analog CMOS cochlea filter with high tunability and ultra-steep roll-off

A bio-realistic analog CMOS cochlea filter with high tunability and ultra-steep roll-off
A bio-realistic analog CMOS cochlea filter with high tunability and ultra-steep roll-off

This paper presents the design and experimental results of a cochlea filter in analog very large scale integration (VLSI) which highly resembles physiologically measured response of the mammalian cochlea. The filter consists of three specialized sub-filter stages which respectively provide passive response in low frequencies, actively tunable response in mid-band frequencies and ultra-steep roll-off at transition frequencies from pass-band to stop-band. The sub-filters are implemented in balanced ladder topology using floating active inductors. Measured results from the fabricated chip show that wide range of mid-band tuning including gain tuning of over 20dB, Q factor tuning from 2 to 19 as well as the bio-realistic center frequency shift are achieved by adjusting only one circuit parameter. Besides, the filter has an ultra-steep roll-off reaching over 300 dB/dec. By changing biasing currents, the filter can be configured to operate with center frequencies from 31 Hz to 8 kHz. The filter is 9th order, consumes 59.5∼ 90.0 μW power and occupies 0.9 mm2 chip area. A parallel bank of the proposed filter can be used as the front-end in hearing prosthesis devices, speech processors as well as other bio-inspired auditory systems owing to its bio-realistic behavior, low power consumption and small size.

Analog VLSI, auditory filter, bio-inspired circuits, CMOS cochlea, floating active inductor
1932-4545
297-311
Wang, Shiwei
97433cb6-7752-4c68-89f8-933f233d8642
Koickal, Thomas Jacob
ca8588e6-32a5-4d70-8068-0a17178a5cc8
Hamilton, Alister
248e45ad-b658-4af3-9bdb-b09caeae9238
Cheung, Rebecca
331f20bf-d60d-42ba-90ad-82a6cb16af30
Smith, Leslie S.
cd83099c-eee3-461d-8989-df88d91dfc3d
Wang, Shiwei
97433cb6-7752-4c68-89f8-933f233d8642
Koickal, Thomas Jacob
ca8588e6-32a5-4d70-8068-0a17178a5cc8
Hamilton, Alister
248e45ad-b658-4af3-9bdb-b09caeae9238
Cheung, Rebecca
331f20bf-d60d-42ba-90ad-82a6cb16af30
Smith, Leslie S.
cd83099c-eee3-461d-8989-df88d91dfc3d

Wang, Shiwei, Koickal, Thomas Jacob, Hamilton, Alister, Cheung, Rebecca and Smith, Leslie S. (2015) A bio-realistic analog CMOS cochlea filter with high tunability and ultra-steep roll-off. IEEE Transactions on Biomedical Circuits and Systems, 9 (3), 297-311, [6869048]. (doi:10.1109/TBCAS.2014.2328321).

Record type: Article

Abstract

This paper presents the design and experimental results of a cochlea filter in analog very large scale integration (VLSI) which highly resembles physiologically measured response of the mammalian cochlea. The filter consists of three specialized sub-filter stages which respectively provide passive response in low frequencies, actively tunable response in mid-band frequencies and ultra-steep roll-off at transition frequencies from pass-band to stop-band. The sub-filters are implemented in balanced ladder topology using floating active inductors. Measured results from the fabricated chip show that wide range of mid-band tuning including gain tuning of over 20dB, Q factor tuning from 2 to 19 as well as the bio-realistic center frequency shift are achieved by adjusting only one circuit parameter. Besides, the filter has an ultra-steep roll-off reaching over 300 dB/dec. By changing biasing currents, the filter can be configured to operate with center frequencies from 31 Hz to 8 kHz. The filter is 9th order, consumes 59.5∼ 90.0 μW power and occupies 0.9 mm2 chip area. A parallel bank of the proposed filter can be used as the front-end in hearing prosthesis devices, speech processors as well as other bio-inspired auditory systems owing to its bio-realistic behavior, low power consumption and small size.

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More information

Published date: 1 June 2015
Keywords: Analog VLSI, auditory filter, bio-inspired circuits, CMOS cochlea, floating active inductor

Identifiers

Local EPrints ID: 446039
URI: http://eprints.soton.ac.uk/id/eprint/446039
ISSN: 1932-4545
PURE UUID: 6d1aa4d7-5bd8-4f62-8aef-29e7b40401e6
ORCID for Shiwei Wang: ORCID iD orcid.org/0000-0002-5450-2108

Catalogue record

Date deposited: 19 Jan 2021 17:33
Last modified: 04 Sep 2021 02:06

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Contributors

Author: Shiwei Wang ORCID iD
Author: Thomas Jacob Koickal
Author: Alister Hamilton
Author: Rebecca Cheung
Author: Leslie S. Smith

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